Yes:
Additional Effect: 10% chance after each tick that the next Thunder spell of any grade will add its full damage over time amount to its initial damage, have no cast time, and cost no MP
Duration: 18s

]

Yes:
Additional Effect: 10% chance after each tick that the next Thunder spell of any grade will add its full damage over time amount to its initial damage, have no cast time, and cost no MP
Duration: 18s

]

Only one Thunder spell-induced damage over time effect per caster can be inflicted upon a single target.